✨ Add icons, slate colour scheme and new user

[srisco]

Hi! I love Congo, I'm using it in my personal website and I want to contribute by adding some icons I needed and a simple "Full" cool-gray color scheme. I also added my website to users.md.

Thanks for your work!

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[jpanther]

Hey @srisco, thanks for your contributions. I have no problem with incorporating these changes. My only comment is that it would be fun to have a name for the colour scheme. Perhaps it could be something like "slate" or "muted"? I'd like to avoid using the word "gray" in the name because it's a very US-centric spelling.

[srisco]

Hi, @jpanther "slate" LGTM. I can change the file name and update the docs referencing the new color theme if you want.

Cheers.

[jpanther]

Thanks, that would be great if you could. Once that's done I'll merge it in.

[jpanther]

Thanks for the changes. I'll merge these in and they'll be included in the next release.